QUICK CHANGE: Arsenal were on course to qualify from Group D when Alex Oxlade-Chamberlain put them 3-0 up against Anderlecht [GETTY]

The Gunners were in cruise control and set to progress to the knock-out stages from Group D when the 21-year-old put them 3-0 up on 58 minutes, adding to Mikel Arteta's penalty and Alexis Sanchez's sublime volley.

But a disastrous last half-hour saw former Portsmouth defender Anthony Vanden Borre score twice and Aleksander Mitrovic equalise in the final minute as Arsenal's defensive frailties were exposed once again.

Arsene Wenger's men require only one point from their remaining two games to qualify for the last-16 but they lie five points behind group leaders Borussia Dortmund - who they face next on November 26.

And Oxlade-Chamberlain was furious Arsenal had not learned the lessons from their own late show in Belgium two weeks ago, where they snatched victory from the jaws of defeat with two late strikes.

“You should be able to see the game out at this level, so we are very disappointed that we weren’t able to do that”

Alex Oxlade-Chamberlain

"The goals were disappointing that we conceded, they were goals that we would liked to have been able to stop at source," he said.

"They were simple goals, we need to stop crosses. We failed to do that and to be fair they managed to put some good balls in and get on the end of them.

"It is hard to put our finger on what went wrong, maybe a bit of complacency there. When you are 3-0 up you can’t afford to have any complacency at this level because you get punished.

"We were at Anderlecht a couple of weeks ago in a similar position to what they are now so we should know better than anyone that the game is not over until the final whistle.

"To be 3-0 up at home and with the way we were playing, we felt we had the game under control. You should be able to see the game out at this level, so we are very disappointed that we weren’t able to do that.

"This is a hard lesson that we can’t be complacent and we have to go into those games with full focus for the 90 minutes and get the job done.